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    <h2 class="font-weight-normal display-1">Bootstrap4教学</h2>
    <div class="bg-light">欢迎收看《小马技术视频》</div>
    <div class="text-center bg-info font-weight-bold">欢迎收看《小马技术视频》</div>
    <div class="text-left bg-light">欢迎收看《小马技术视频》</div>
    <div class="text-right bg-dark text-white">欢迎收看《小马技术视频》</div>
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